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Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

Many new wasm features are enabled if compile wasm32v1-none with -C linker-plugin-lto flag on LLVM 20+ A-linkers Area: linkers... you gotta love linkers A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140174 opened Apr 22, 2025 by StackOverflowExcept1on
3
Bad codegen for comparing struct of two 16bit ints A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code.
#140167 opened Apr 22, 2025 by bjorn3
5
armv4t-none-eabi cannot use compiler_fence A-atomic Area: Atomics, barriers, and sync primitives A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. O-Arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140105 opened Apr 21, 2025 by EvansJahja
3
Not optimize boolean computations for the usize type A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140103 opened Apr 21, 2025 by ZhonghaoPan-nju
7
Creating an array can be made 2x faster A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139875 opened Apr 15, 2025 by abgros
2
Simpler Logic Produces More Complex Output Than Equivalent Expression A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139851 opened Apr 15, 2025 by ZhonghaoPan-nju
2
[Optimization] Significantly different assembly output for logically equivalent match patterns with string comparisons A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-patterns Relating to patterns and pattern matching C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139784 opened Apr 14, 2025 by ZhonghaoPan-nju
4
Bounds check not elided for index that should be known to be in-bounds A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#139759 opened Apr 13, 2025 by okaneco
2
assert_eq! of trivially-equal enums with 2 non-empty variants is not optimized out A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139733 opened Apr 13, 2025 by ZhonghaoPan-nju
@dianqk
6
A case of compound x86_64 performance regression caused by LLVM 20 and #124810 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such P-high High priority regression-untriaged Untriaged performance or correctness regression. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#139730 opened Apr 13, 2025 by MoSal
3
matching on ordered enum variants emits too many branches A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139702 opened Apr 12, 2025 by Rudxain
Error: "offset is not a multiple of ??" A-diagnostics Area: Messages for errors, warnings, and lints A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. F-abi_x86_interrupt T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139679 opened Apr 11, 2025 by ViktorPopp
1
Consider using AssignmentTracking / dbg_assign A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139623 opened Apr 10, 2025 by nikic
[RISCV] Code model other than medium does not work with lto A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. I-prioritize Issue: Indicates that prioritization has been requested for this issue. O-riscv Target: RISC-V architecture regression-from-stable-to-stable Performance or correctness regression from one stable version to another. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue
#139479 opened Apr 7, 2025 by kxxt
11
Performance regression in nightly with target-cpu=native on znver4 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. O-x86_64 Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64) P-high High priority regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139370 opened Apr 4, 2025 by nsarlin-zama
24
SIGSEGV when crosscompiling m68k on Apple silicon A-cross Area: Cross compilation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. O-motorola68k Target: Rust from the parallel universe where the Amiga won. S-needs-repro Status: This issue has no reproduction and needs a reproduction to make progress. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139311 opened Apr 3, 2025 by ketsuban
constructor doesn't work with arm64e-apple-ios but works on arm64e-apple-darwin A-linkage Area: linking into static, shared libraries and binaries A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. O-AArch64 Armv8-A or later processors in AArch64 mode O-apple Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS) O-ios Operating system: iOS
#139218 opened Apr 1, 2025 by ds-ep
7
Intrinsics wrappers not being inlined A-codegen Area: Code generation A-intrinsics Area: Intrinsics A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139160 opened Mar 31, 2025 by mxple
4
Linker-plugin-based LTO with -flto in clang not working A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138910 opened Mar 24, 2025 by ghost
1
rustc-LLVM ERROR: Cannot select with -C code-model=large A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ O-x86_32 Target: x86 processors, 32 bit (like i686-*) (IA-32) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138899 opened Mar 24, 2025 by konstin
3
RISC-V RVV not enabled despite -Ctarget-cpu=native A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-bug Category: This is a bug. O-riscv Target: RISC-V architecture T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138789 opened Mar 21, 2025 by ThomasHabets
6
ICE: Architecture x86_64 does not support GpuKernel calling convention A-ABI Area: Concerning the application binary interface (ABI) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. F-abi_ptx `#![feature(abi_ptx)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138738 opened Mar 20, 2025 by matthiaskrgr
3
Removing trailing zeros of a NonZero A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#138497 opened Mar 14, 2025 by leonardo-m
6
Compiling to Apple's arm64e got linking error! A-linkage Area: linking into static, shared libraries and binaries A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. O-macos Operating system: macOS
#138481 opened Mar 14, 2025 by Wyvern
3
Investigate why repr-128-dwarf doesn't fail in CI test jobs A-compiletest Area: The compiletest test runner A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-download-rustc Area: The `rust.download-rustc` build option. A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-test-infra Area: test infrastructure (may span bootstrap/compiletest/more) C-bug Category: This is a bug. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue.
#138334 opened Mar 11, 2025 by jieyouxu
5
ProTip! Add no:assignee to see everything that’s not assigned.